Synthesis of TiO2 mesocrystal film with enhanced photocatalytic activity

TiO 2 mesocrystals can considerably enhance charge separation owing to their oriented superstructures, with fewer internal defects and porous properties providing more active sites. In this work, we prepared TiO 2 mesocrystal films by a direct annealing method. The morphology and crystal phase of the film were controlled by adjusting the ratio of NH 4 F and the calcination temperature. Moreover, we found that Au nanoparticles loaded on a TiO 2 mesocrystal film enabled highly efficient visible light photocatalytic properties. The photocatalytic activities were studied by hydrogen generation and photoreduction of Cr(VI). This work represents a considerable advance in the development and application of the TiO 2 mesocrystals.